Battery management system, battery pack including same, and method of establishing charging protocol of lithium secondary battery
Abstract
A charging protocol establishment method and battery management system of a lithium secondary battery are provided, wherein, for a two-electrode battery cell, a closed-circuit voltage (CCV SOCx ) and an open-circuit voltage (OCV SOCx ) according to a state of charge (SOCx) during charging with each charging current (I) are measured according to Equation 1 below, and by collecting internal resistance profiles plotting the internal resistance value (R SOCx ) according to the state of charge for each charge current (I), limit state of charges corresponding to each charge current are determined from the internal resistance profiles. Internal resistance value according to state of charge ( R SOCx ) = ( CCV SOCx - OCV SOCx ) / I Equation 1
Claims
exact text as granted — not AI-modified1 . A battery management system comprising:
a measure configured to measure, for a two-electrode battery cell having a positive electrode and a negative electrode, a closed circuit voltage (CCV SOCx ) and an open circuit voltage (OCV SOCx ), respectively, according to a state of charge (SOCx), when charged with different charging currents (I): a memory configured to collect and store internal resistance profiles plotting the internal resistance value (R SOCx ) according to the state of charge for each charging current (I), by substituting the measured CCV SOCx and OCV SOCx into Equation 1 below to calculate the internal resistance value (R SOCx ) according to the state of charge; and a controller configured to determine, from the internal resistance profiles, limit state of charges for each charging current, and to establish a charging protocol based thereon.
Internal
resistance
value
according
to
state
of
charge
(
R
SOCx
)
=
(
CCV
SOCx
-
OCV
SOCx
)
/
I
[
Equation
1
]
2 . The battery management system of claim 1 , wherein the control portion is configured to determine the limit state of charges for each charging current (I) as corresponding to a state of charge (SOCx) value, at a point where the graphical shape of the internal resistance profile for each charging current (I) changes from flat to a downward trend.
3 . The battery management system of claim 1 , wherein the control portion is configured to re-establish the charging protocol by periodically, during repeated charging and discharging of the battery cells, deriving a new limit state of charges for to each charging current.
4 . The battery management system of claim 1 , further comprising a connecting portion configured to connect with a charging device to supply a charging current to the battery cell according to the charging protocol established by the control portion.
5 . The battery management system of claim 1 , wherein the measurer is configured to measure a status information of the battery cell comprising at least one of a voltage of the battery cell and a state of charge.
6 . The battery management system of claim 1 , wherein the charging current (I) is selected from a range of 0.33 C to 6.0 C.
7 . A battery pack comprising a battery management system according to claim 1 .
8 . The battery pack of claim 7 , wherein the battery pack comprises a plurality of battery cells having a capacity of 40 to 200 Ah.
9 . A method for establishing a lithium secondary battery charging protocol comprising:
(a) measuring a closed circuit voltage (CCV SOCx ) and an open circuit voltage (OCV SOCx ) according to the state of charge (SOCx), respectively, for a two-electrode battery cell with a positive electrode and a negative electrode, when charged with different charging currents (I); (b) substituting the measured CCV SOCx and OCV SOCx into Equation 1 below to calculate an internal resistance value (R SOCx ) according to the state of charge, and collecting an-internal resistance profiles plotting the internal resistance value (R SOCx ) according to the state of charge, for each charging current (I); and (c) determining, from the collected internal resistance profiles, limit state of charges corresponding to each charging current;
Internal
resistance
value
according
to
state
of
charge
(
R
SOCx
)
=
(
CCV
SOCx
-
OCV
SOCx
)
/
I
[
Equation
1
]
10 . The method for establishing a lithium secondary battery charging protocol of claim 9 , wherein in process (c), the limit state of charges for each charging current (I) are determined as corresponding to a state of charge (SOC) value at a point where the graphical shape of the internal resistance profile for each charging current (I) changes from flat to a downward trend.
11 . The method for establishing the lithium secondary battery charging protocol of claim 9 , wherein the two-electrode battery cell has a capacity of 40 to 200 Ah.
12 . The method for establishing the lithium secondary battery charging protocol of claim 9 , wherein in process (a), the charging current (I) is selected from the range of 0.33 C to 6.0 C.
13 . The method for establishing the lithium secondary battery charging protocol of claim 12 , wherein in process (a), the charging current (I) is set at an interval of 0. 1C to 1.0 C.
14 . The method for establishing the lithium secondary battery charging protocol of claim 9 , further comprising mapping a charging protocol based on the limit state of charges by charging current, wherein the mapping process maps so that charging with each charging current proceeds up to the corresponding limit state of charge for that charging current, but the charging current selected for charging decreases as the state of charge of the battery increases.Join the waitlist — get patent alerts
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